From the back of the book: Forbidden Religions includes: A wide selection of belief systems, some widespread and cloaked in secrecy, others extreme in their focus, from Golconda-seekers and Gehenna cults to infernal religions and churches dedicated to methuselahs. New powers, rituals, and coterie types befitting these religions. New optional Loresheets, Merits, and Flaws, for use at character creation or to build into your characters as they gain experience.